The receiver reads
the transmission at precisely the
middle of its
clock
to determine the value
of the transmitted bit.

The sender's clock runs at
1000 Hz and the
receiver's clock
runs at 999 Hz.

Suppose the receiver does
not re-synchronize its
clock to the
sender's clock.

If the
sender's and the receiver's clocks
are synchronized
at the start of a (long) transmission,
which bit poistion
is the first bit
that the receiver
will receive incorrectly due to the clock drift ?